GDCM Release 2.0

GDCM release 2.0 is a complete ground up rewrite of GDCM 1.x, it's initial goal was simply to provide the same functionalities as GDCM 1.x.
GDCM 2.0.x has been superseeded by the 2.2.x branche GDCM Release 2.2.

Fix issues with writing Enhanced MR/CT Image Storage (IOP and IPP): Image Position (Patient) needs to be duplicate in the Per Frame SQ, Image Orientation (Patient) & Spacing needs to be in the Shared SQ.

Fix issue with deflate syntax

Bug fix: vtkImageData::Origin is not Image Position (Patient) when doing VTK-flip

Big Endian machine are passing 95% of tests now.

First pass at implementing DICOM Part 3 (accessible from python!)

Add an example on how to decompress ELSCINT1 / PMSCT_RLE1 DICOM file

Add an example to check if the file is a valid deflate file (will use alternate implementation of deflate algorithm: puff.c)